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Let me first say that USB Mulitboot is incredible!
Here is my issue. I just got done imaging some Lenovo X200 tablets with Zenworks Imaging 7. They won't boot however, I just get the blinking cursor. When I have a USB key plugged in that has USB Mulitboot I can choose Boot XP from Hard Drive 1 and the OS comes up perfect! So I'm guessing my MBR is somehow looking for the wrong hard drive (hard drive 0 to boot?). Usually I can fix this problem by booting to the recovery console and running fixboot followed by fixmbr, but it is not working this time. Fixmbr just screws up the MBR even worse and then I can't even boot from USB Multiboot. Is there a way that I can edit the MBR to fix this?